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Properties of sound

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on 26 July 2017

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Transcript of Properties of sound

Properties of sound
What is loudness?
What is pitch?
What causes shock waves?
What are some main parts of the human ear?
What are some causes of hearing loss?
The Doppler Effect
By: Group Beta
Guiding Questions
Is an important property of sound.
It describes your perception of the energy of a sound.
The loudness of a sound depends on two factors; the amount of energy needed to make the sound and the distance from the source of the sound.
Energy of a Sound Source
The Human Ear
Generally the greater amount of energy used to make a sound, the louder it will sound.
Distance from a Sound Source

Loudness will increase the closer you are to a sound source, and will decrease the farther away you are.
The Doppler effect describes the change of frequency in a wave after the source moves in relation to the user.
When a sound source moves, the frequency of the waves changes because the motion of the source adds to the motion of the waves.

Pitch of a sound is based on how high or low the sound seems to a person.
Pitch of a sound that you hear depends on the frequency of the sound wave.
Sound waves with high frequency have a high pitch.
Changing Pitch
When you speak or sing , air from your lungs is forced up the trachea, or wind pipe.
Air then rushes past your vocal cords causing them to vibrate. This makes sound waves.
Your vocal cords are able to vibrate more than 1,000 times per second.
The human ear is an organ of hearing and balance.
Inner Ear
The inner ear converts sound waves into a form that travels to your brain.
Middle Ear
Behind the eardrum is the middle ear.
The middle ear transmits the waves inward.
Outer Ear
The outer ear funnels sound waves and directs them into a narrow region called the ear canal.

Hearing loss:
If a person has hearing loss, they may have trouble hearing soft or high-pitched sounds. There are many causes of hearing loss, including injury, infection, exposure of loud sounds and aging. Hearing loss can be permanent or temporary.

Hearing aids:
Hearing aids can sometimes help with hearing loss. They help amplify sounds that enter your ear. They can come in different sizes and customizations to fit your issue.
Design and Build Hearing Protectors

We used various items, to act as soundproof materials, and by doing this, we made two headphones. We started by getting two Styrofoam cups, with two plastic cups inside them. Then we filled the cups with the different materials that we chose. They were Play-Doh, cotton balls, and tissues. We measured the minimum distance from a sound source(ticking clock) so that we could no longer here it.
Sound and Light, Prentice hall science explorer pages 42-47, and 54-56
Jay M. Pasachoff, Ph.D Professor of Astronomy Williams College Williamstown, Massachusetts

Damage of the ear drum
Full transcript